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iommu/io-pgtable-arm: Check for v7s-incapable systems

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On machines with no 32-bit addressable RAM whatsoever, we shouldn't
even touch the v7s format as it's never going to work.

Fixes: e5fc9753b1 ("iommu/io-pgtable: Add ARMv7 short descriptor support")
Reported-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Robin Murphy 2016-09-13 18:02:02 +01:00 committed by Will Deacon
parent fade1ec055
commit 82db33dc5e
1 changed files with 4 additions and 0 deletions
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4
drivers/iommu/io-pgtable-arm-v7s.c
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@ -633,6 +633,10 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
{
struct arm_v7s_io_pgtable *data;
#ifdef PHYS_OFFSET
if (upper_32_bits(PHYS_OFFSET))
return NULL;
#endif
if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS)
return NULL;